let age:number = 90
let username:string = 'list'
let isSameColor:boolean = false

// let arr = [1,2,3,'PK']
// console.log(arr);

let arr:Array<number> = [1,2,3,6]
let arr2:string[] = ['list','PK']
function add (a:number,b:number):number
{
    return a+b
}
function sayhi():void
{
    console.log('hi');
}
let x:number = add(3,4)
console.log(x);
sayhi()